In the year 1997, a probationary secret agent sacrifices his life during a mission in the Middle East in order to save his term. Feeling guilty, his colleague, Henry Hart (codenamed "Galahad") delivers a bravery medal to the agent's widow, Michelle Unwin, but she refuses it out of devastation and frustration that she can not even be told how her husband died. Hart instead gives the medal to her young son, Gary "Eggsy", telling him to call the number on the back of the medal if he ever needs help.
Seventeen years later, Eggsy is now an unemployed young adult, still living with his mother, along with his baby half-sister and abusive step-father Dean. Eggsy is both intelligent and physically fit, he left training for the Royal Marines in order to be there for his mother.
- Taron Egerton as Eggsy Unwin
- Colin Firth as Henry Hart/Galahad:
- Samuel L. Jackson as Richmond Valentine:
- Michael Caine as Chester King/Arthur:
The film received mixed-to-positive reviews, with praise being given to the storyline and wit, with criticism of the excessive violence and inconsistent pace.
Out of 207 critics on Rotten Tomatoes, 74% of the critics gave the film a positive rating, with an average rating of 6.7 out of 10. Also on Rotten Tomatoes, 85% of the audience enjoyed it, with an average score of 4/5. From 39 critics on Metacritic, the film received a score of 58, indicating mixed or average reviews.